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 Forum index » DIY Hardware and Software
TR-808 Voice STRIP Boards...
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RyBowk



Joined: Nov 25, 2018
Posts: 17
Location: England

PostPosted: Mon Feb 11, 2019 2:39 pm    Post subject: Reply with quote  Mark this post and the followings unread

You sir are a genius
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kropo



Joined: Jan 29, 2019
Posts: 15
Location: Finland

PostPosted: Fri Feb 15, 2019 12:25 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi

Wow! Adding these to build list. Could you provide couple pictures for noobs like me? How that 100nf should be added there? And noise in, it that something where the pink noise out should be connected? And can this be used with 12v?

Regards

Jake
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helix_modular



Joined: Aug 31, 2017
Posts: 27
Location: Germany

PostPosted: Fri Feb 15, 2019 12:50 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi kropo,

That's great. I think they are quite cool, even if toms aren't that highly regarded...

For the decoupling caps: ideally these should be mounted from V+ or V- to ground respectively, but you can easily get away with bypassing V+ to V- with anything between 10nF to 100nF ceramic capacitors. Just solder them on the reverse side of the terminals of the ICs (diagonally). (Keep in mind it's mirrored on the reverse side). So in this case:

TL072:
pin 4 (V-) -- cap (-||-) -- pin 8 (V+)
TL071:
pin 4 (V-) -- cap (-||-) -- pin 7 (V+)

But you can probably simply leave them out as well.

Noise IN shall be connected to Pink Noise. I added the Pink Noise Out for use with a switched jack (for use with an external noise source).

As for operation on +/-12V... cannot really say. The tuning is probably a bit off. And you would probably have to increase R252 (mid tom) to ~5k6. Just try it.


Cheers, helix
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kropo



Joined: Jan 29, 2019
Posts: 15
Location: Finland

PostPosted: Fri Feb 15, 2019 1:16 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi

Thanks for fast reply. I think I got it now. Thanks.


Regards

Jake
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kropo



Joined: Jan 29, 2019
Posts: 15
Location: Finland

PostPosted: Sat Feb 16, 2019 2:20 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi

Forgot to ask, should I add accent potentiometer to all modules or just one for all modules? Does it matter?

Regards

Jake
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helix_modular



Joined: Aug 31, 2017
Posts: 27
Location: Germany

PostPosted: Sat Feb 16, 2019 9:06 am    Post subject: Reply with quote  Mark this post and the followings unread

There is plenty of coverage on accent in this thread already (I know it's quite a read). But roughly said, when in doubt, simply tie the accent to V+. But nearly every other configuration is possible as well: Pot for each, (switched) accent in jack with attenuator,... I'd suggest you try what works best for you.

Cheers
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Apollo View



Joined: Sep 24, 2017
Posts: 21
Location: London

PostPosted: Sun May 05, 2019 4:59 am    Post subject: Reply with quote  Mark this post and the followings unread

Just wanted to say massive thank you to everyone in this thread. Today I finally housed my clone in a safe wooden case. The electronics have been sat waiting for this day for over a year. But I finally plugged it in and everything is working at it should (bar a little hum on the clap as the jumpers seem to be antennas.


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artilect99



Joined: Oct 01, 2018
Posts: 31
Location: USA

PostPosted: Wed May 29, 2019 12:38 pm    Post subject: Reply with quote  Mark this post and the followings unread

Wow, that's a nice piece of work Apollo. Great looking panel, though it looks a bit more like a 909! Razz

I just got my snare working and am moving on to the hihats and clap/maracas next. I probably won't do all the voices but I might mount those 4 behind a 20HP panel or something.
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SawSquareSine



Joined: Jun 02, 2019
Posts: 1
Location: US

PostPosted: Sun Jun 02, 2019 5:51 pm    Post subject: Trouble with Cowbell A sound sourse
Subject description: Any recommendations for how to troubleshoot?
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Hi all, I am having an issue where I get no sound from output on Cowbell A, B is working fine and I can tune with the trimpot but I get nothing from A. Does anyone happen to know the path or pin that A is derived from? Trying to troubleshoot but currently stuck, any help would be greatly appreciated. Thanks all!
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